package io.lckgroup.modules.lck.utils;

import io.lckgroup.common.utils.Constant;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

/**
 * @author tw
 * @Description: 用户微信前端页面的jssdk配置使用
 */
public class JSSDK_Util {

    private static final String APPID = Constant.WxgzhConfig.GZH_APPID;

    public static Map<String, String> jsSDK_Sign(String url) {
        Map<String, String> ret = new HashMap<String, String>();
        String nonce_str = create_nonce_str();
        String timestamp = create_timestamp();
        String jsapi_ticket = WxUtils.getTicket();
        String string1;
        String signature = "";
        //注意这里参数名与微信那边要求要一致，且必须有序
        string1 = "jsapi_ticket=" + jsapi_ticket +
                "&noncestr=" + nonce_str +
                "&timestamp=" + timestamp +
                "&url=" + url;
        try {
            MessageDigest crypt = MessageDigest.getInstance("SHA-1");
            crypt.reset();
            crypt.update(string1.getBytes("UTF-8"));
            signature = byteToHex(crypt.digest());
        } catch (NoSuchAlgorithmException e) {

        } catch (UnsupportedEncodingException e) {

        }
        ret.put("url", url);
        ret.put("appId", APPID);
        ret.put("jsapi_ticket", jsapi_ticket);
        ret.put("nonceStr", nonce_str);
        ret.put("timestamp", timestamp);
        ret.put("signature", signature);
        return ret;
    }

    private static String byteToHex(final byte[] hash) {
        Formatter formatter = new Formatter();
        for (byte b : hash) {
            formatter.format("%02x", b);
        }
        String result = formatter.toString();
        formatter.close();
        return result;
    }

    private static String create_nonce_str() {
        return UUID.randomUUID().toString();
    }

    private static String create_timestamp() {
        return Long.toString(System.currentTimeMillis() / 1000);
    }
}
